package org.bouncycastle.bcpg;

import java.io.*;
import java.math.BigInteger;

/**
 * base class for an DSA Public Key.
 */
public class DSASecretBCPGKey 
	extends BCPGObject implements BCPGKey 
{
	MPInteger	x;
	
	/**
	 * 
	 * @param in
	 * @throws IOException
	 */
	public DSASecretBCPGKey(
		BCPGInputStream	in)
		throws IOException
	{
		this.x = new MPInteger(in);
	}

	/**
	 * 
	 * @param x
	 */
	public DSASecretBCPGKey(
		BigInteger	x)
	{
		this.x = new MPInteger(x);
	}
	
	/**
	 *  return "PGP"
	 * 
	 * @see org.bouncycastle.bcpg.BCPGKey#getFormat()
	 */
	public String getFormat() 
	{
		return "PGP";
	}

	/**
	 * return the standard PGP encoding of the key.
	 * 
	 * @see org.bouncycastle.bcpg.BCPGKey#getEncoded()
	 */
	public byte[] getEncoded() 
	{
		try
		{ 
			ByteArrayOutputStream	bOut = new ByteArrayOutputStream();
			BCPGOutputStream			pgpOut = new BCPGOutputStream(bOut);
		
			pgpOut.writeObject(this);
		
			return bOut.toByteArray();
		}
		catch (IOException e)
		{
			return null;
		}
	}
	
	public void encode(
		BCPGOutputStream	out)
		throws IOException
	{
		out.writeObject(x);
	}
	
    /**
     * @return x
     */
    public BigInteger getX()
    {
        return x.getValue();
    }
}
